Knight, a redshirt freshman who struggled in Oklahoma’s 16-7 win over West Virginia on Saturday, suffered a bruised knee at the end of the first half and played poorly in the second half. Stoops said Knight won’t practice for two weeks.

After the injury, Knight was 1-of-5 with two interceptions in the third quarter.

The 6-6, 252-pound Bell has been a goal-line specialist for Oklahoma, rushing for a combined 24 touchdowns in 2011 and ’12. He replaced Knight in the fourth quarter against the Mountaineers and is 3 of 6 passing for 38 yards this season. He has yet to throw a touchdown pass in his career.

Kendal Thompson, expected to return to practice this week after breaking his foot in the first practice of preseason camp, will be Bell’s backup against Tulsa (1-1).

Knight has completed 21 of 48 passes for 205 yards, four touchdowns and three interceptions this season.